CN101994020B - Method for preparing K4169 alloy by using nickel-base cast high-temperature alloy K4169 returns - Google Patents
Method for preparing K4169 alloy by using nickel-base cast high-temperature alloy K4169 returns Download PDFInfo
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Abstract
The invention discloses a method for preparing K4169 alloy by using nickel-base cast high-temperature alloy K4169 returns. The method comprises the following steps of: pretreating the K4169 alloy returns and performing primary smelting; performing secondary smelting dosing according to a scheme of 10 to 50 weight percent of the first return and 50 to 90 weight percent of novel materials; preparing return alloy ingots through the secondary smelting; performing the third smelting dosing according to a scheme of 10 to 50 percent of the secondary return and 50 to 90 percent of novel materials; preparing return alloy ingots through third smelting; and performing uniform heat treatment on the return alloy ingots prepared through the third smelting. In the method, the K4169 alloy returns are fully utilized and the waste of noble metal resources is reduced. Due to the three-time smelting, the prepared K4169 alloy has good alloy plasticity, high mid-temperature strength, excellent durability and high stability, reaches a level of novel material alloys, and can be widely applied to engines in multiple models.
Description
Technical field
The invention belongs to the nickel-base alloy technical field, be specifically related to a kind of method of utilizing nickel-base cast superalloy K4169 returns to prepare the K4169 alloy.
Background technology
Originally the K4169 alloy is to use as deforming alloy, is used for aircraft engine with the casting alloy form to nineteen sixty-five.The K4169 alloy is equivalent to the Inconel718C alloy of the U.S., is with γ, and " reaching γ ' mutually is the precipitation strength type Ni-Cr-Fe based high-temperature alloy of strengthening phase mutually.This alloy all has higher intensity, plasticity, superior corrosion resistance, radioresistance and good welding property in very wide, in the low temperature range (253-700 ℃), this alloy is mainly used in the strong structural part of mover antioxygen heat-transmission of working below 650 ℃ and the production of casing foundry goods.The chemical ingredients of K4169 alloy (quality %) C0.02～0.08, Cr18.00～21.00, Mo2.85～3.30, Al0.40～0.70, Ti0.75～1.15, Nb+Ta4.50～5.40; Si≤0.35, Mn≤0.35, S≤0.015, P≤0.015, Co≤1.00; Cu≤0.30, B≤0.006, Zr≤0.05, Sb≤0.001, Bi≤0.00005; Sn≤0.002, Pb≤0.001, AS≤0.002, Ni52～54, all the other are Fe.
When the K4169 alloy that uses at present is used for aero-engine casing class castings production; Casing spare generally is merely 30～50% to the utilization ratio of alloy; There are a large amount of returns to produce in the production; As revert alloy is not rationally utilized, will strengthen the production cost of mover, therefore be necessary to carry out the utilization research of K4169 returns.
Summary of the invention
To the present situation that the K4169 returns utilize, the present invention provides a kind of method of utilizing nickel-base cast superalloy K4169 returns to prepare the K4169 alloy.
The process step of the inventive method is following.
(1) K4169 alloy returns pre-treatment
To the returns that produce in the K4169 alloy-steel casting production process is that rising head, running channel and waste casting carry out the blast processing; Returns are put into blowing machine; Compressed air pressure is controlled to be 0.3～0.6MPa, and it is the silica sand of 3～5mm that blast adopts granularity, blast is carried out on the returns surface handle; Blow off the surperficial oxide debris of returns, formwork, sticking iron, be mingled with and burning into sand, make bright and clean, the no-sundries of material surface.
(2) K4169 alloy returns melting once
Adopt vacuum induction melting furnace to carry out the melting of alloy, the concrete operations step is: when vacuum tightness≤1.33Pa, begin to heat up, the control temperature rise rate is 10～15 ℃/min; When alloy surface presented garnet, the control temperature rise rate was 10～20 ℃/min, is warming up to 1570～1590 ℃ of refining temperatures; Control refining time 20～30min has a power failure after the refining, stops heating; To alloy liquid level conjunctiva, controlling temperature rise rate then is 15～20 ℃/min, washes sull open; When temperature rises to 1430～1450 ℃, pour into a mould teeming speed 2～4kg/s.For reducing the foreign matter content of alloy, the casting process of alloy is through two-stage filtration net filtration, one-level filtering net aperture 6～9mm; Be used to block bulk inclusion; Filtering net aperture, the second stage 3～5mm is used for filtration and absorption to fine foreign matter, reaches the effect of purify hot metal.
(3) secondary smelting batching
Material ingot to after the returns melting once carries out chemical composition analysis, and by percentage to the quality, by the scheme batching of 10～50% returns+50～90% virgin materials, virgin material promptly refers to new K4169 alloy material.Returns+virgin material should meet following chemical constitution and require (quality %):
C0.03～0.07, Cr19.0～20.0, Mo2.95～3.20, Al0.50～0.65, Ti0.85～1.10, Ni52.0～54.0, Nb+Ta4.80～5.30, all the other are Fe.
As do not meet above requirement, then add respective element again on the basis in returns+virgin material batching, with elementary composition being adjusted into (quality %) after the batching:
C0.065, Cr19.5, Mo3.15, Al0.60, Ti1.0, Ni52.5, Nb+Ta5.15, all the other are Fe.
(4) secondary smelting prepares the revert alloy ingot
Adopt vacuum induction melting furnace to carry out the melting of alloy, the concrete operations step is: the element that melting once returns ingot, virgin material ingot and adjustment composition are added is together packed in the crucible, when vacuum tightness≤0.67Pa, begins to heat up; The control temperature rise rate is 10～15 ℃/min, and when alloy surface presented garnet, the control temperature rise rate was 10～20 ℃/min, is warming up to 1570～1590 ℃ of refining temperatures; Control refining time 20～30min has a power failure after the refining, stops heating; To alloy liquid level conjunctiva, controlling temperature rise rate then is 15～20 ℃/min, washes sull open; When temperature rises to 1430～1450 ℃, pour into a mould teeming speed 2～4kg/s.
(5) three meltings batching
Material ingot to behind the returns secondary smelting carries out chemical composition analysis, and by percentage to the quality, by the scheme batching of 10～50% secondary returns+50～90% virgin materials, virgin material promptly refers to new K4169 alloy material.Secondary returns+virgin material should meet following chemical constitution and require (quality %):
C0.03～0.07, Cr19.0～20.0, Mo2.95～3.20, Al0.50～0.65, Ti0.85～1.10, Ni52.0～54.0, Nb+Ta4.80～5.30, all the other are Fe.As do not meet above requirement, then add respective element again on the basis in secondary returns+virgin material batching, with elementary composition being adjusted into (quality %) after the batching:
C0.065, Cr19.5, Mo3.15, Al0.60, Ti1.0, Ni52.5, Nb+Ta5.15, all the other are Fe.
(6) three meltings prepare the revert alloy ingot
Adopt vacuum induction melting furnace to carry out the melting of alloy, the concrete operations step is: the element that secondary smelting returns ingot, virgin material ingot and adjustment composition are added is together packed in the crucible, when vacuum tightness≤0.67Pa, begins to heat up; The control temperature rise rate is 10～15 ℃/min, and when alloy surface presented garnet, the control temperature rise rate was 10～20 ℃/min, is warming up to 1570～1590 ℃ of refining temperatures; Control refining time 20～30min has a power failure after the refining, stops heating; To alloy liquid level conjunctiva, controlling temperature rise rate then is 15～20 ℃/min, washes sull open; When temperature rises to 1430～1450 ℃, pour into a mould teeming speed 2～4kg/s.
(7) homogenizing thermal treatment
Revert alloy ingot homogenizing process of thermal treatment condition to three meltings preparation is: 1095 ℃ ± 10 ℃, and time 2h ± 5min, after homogenizing thermal treatment, elements segregation situation such as Nb, Ti obviously improve.
Table 1 has been listed the mechanical property of alloy.
Table 1K4169 alloy enduring quality
Annotate: X1 represents virgin material alloy first stove, and F1-1 represents melting once revert alloy first stove, and the rest may be inferred by analogy for it.
The principal feature of the inventive method is following:
(1) fusion process of K4169 alloy returns is carried out 1570～1590 ℃, the high temperature refining treatment of 20～30min, utilize the high temperature high vacuum condition further to reduce the foreign matter content of revert alloy.
(2) casting process to K4169 alloy returns adopts double-stage filtering, plays the effect that purifies alloy.
The present invention has made full use of K4169 alloy returns, has reduced the waste of precious metal resource, through three meltings; Good, the medium temperature intensity of K4169 alloy plasticity of preparation, enduring quality are good; And good stability, reached the level of virgin material alloy, can be widely used in the mover of a plurality of models.Adopt the inventive method, produce cost-saved 200,000 yuan of K4169 alloy per ton,, create economic benefit and can reach about 1,000 ten thousand yuan according to utilizing every year 50 tons of K4169 alloy returns to calculate.
Embodiment
Embodiment 1
It is following to utilize nickel-base cast superalloy K4169 returns to prepare the method process step of K4169 alloy.
(1) K4169 alloy returns pre-treatment
To the returns that produce in the K4169 alloy-steel casting production process is that rising head, running channel and waste casting carry out the blast processing; Returns are put into blowing machine; Compressed air pressure is controlled to be 0.45MPa, and it is the silica sand of 4mm that blast adopts granularity, blast is carried out on the returns surface handle; Blow off the surperficial oxide debris of returns, formwork, sticking iron, be mingled with and burning into sand, make bright and clean, the no-sundries of material surface.
(2) K4169 alloy returns melting once
Adopt vacuum induction melting furnace to carry out the melting of alloy, the concrete operations step is: when vacuum tightness≤1.33Pa, begin to heat up, the control temperature rise rate is 13 ℃/min; When alloy surface presented garnet, the control temperature rise rate was 15 ℃/min, is warming up to 1580 ℃ of refining temperatures; Control refining time 25min has a power failure after the refining, stops heating; To alloy liquid level conjunctiva, controlling temperature rise rate then is 17 ℃/min, washes sull open; When temperature rises to 1440 ℃, pour into a mould teeming speed 3kg/s.For reducing the foreign matter content of alloy, the casting process of alloy is through two-stage filtration net filtration, one-level filtering net aperture 7mm; Be used to block bulk inclusion; Filtering net aperture, second stage 4mm is used for filtration and absorption to fine foreign matter, reaches the effect of purify hot metal.
(3) secondary smelting batching
Material ingot to after the returns melting once carries out chemical composition analysis, and by percentage to the quality, by the scheme batching of 30% returns+70% virgin material, virgin material promptly refers to new K4169 alloy material.Returns+virgin material meets following chemical constitution and requires (quality %):
C0.05, Cr19.5, Mo3.10, Al0.60, Ti0.92, Ni53.0, Nb+Ta5.00, all the other are Fe.
(4) secondary smelting prepares the revert alloy ingot
Adopt vacuum induction melting furnace to carry out the melting of alloy, the concrete operations step is: the element that melting once returns ingot, virgin material ingot and adjustment composition are added is together packed in the crucible, when vacuum tightness≤0.67Pa, begins to heat up; The control temperature rise rate is 13 ℃/min, and when alloy surface presented garnet, the control temperature rise rate was 15 ℃/min, is warming up to 1580 ℃ of refining temperatures; Control refining time 25min has a power failure after the refining, stops heating; To alloy liquid level conjunctiva, controlling temperature rise rate then is 18 ℃/min, washes sull open; When temperature rises to 1440 ℃, pour into a mould teeming speed 3kg/s.
(5) three meltings batching
Material ingot to behind the returns secondary smelting carries out chemical composition analysis, and by percentage to the quality, by the scheme batching of 30% secondary returns+70% virgin material, virgin material promptly refers to new K4169 alloy material.Secondary returns+virgin material meets following chemical constitution and requires (quality %):
C0.05, Cr19.5, Mo3.10, Al0.60, Ti0.92, Ni53.0, Nb+Ta5.00, all the other are Fe.
(6) three meltings prepare the revert alloy ingot
Adopt vacuum induction melting furnace to carry out the melting of alloy, the concrete operations step is: the element that secondary smelting returns ingot, virgin material ingot and adjustment composition are added is together packed in the crucible, when vacuum tightness≤0.67Pa, begins to heat up; The control temperature rise rate is 13 ℃/min, and when alloy surface presented garnet, the control temperature rise rate was 15 ℃/min, is warming up to 1580 ℃ of refining temperatures; Control refining time 25min has a power failure after the refining, stops heating; To alloy liquid level conjunctiva, controlling temperature rise rate then is 17 ℃/min, washes sull open; When temperature rises to 1440 ℃, pour into a mould teeming speed 3kg/s.
(7) homogenizing thermal treatment
Revert alloy ingot homogenizing process of thermal treatment condition to three meltings preparation is: 1095 ℃ ± 10 ℃, and time 2h ± 5min, after homogenizing thermal treatment, elements segregation situation such as Nb, Ti obviously improve.
Embodiment 2
It is following to utilize nickel-base cast superalloy K4169 returns to prepare the method process step of K4169 alloy.
(1) K4169 alloy returns pre-treatment
To the returns that produce in the K4169 alloy-steel casting production process is that rising head, running channel and waste casting carry out the blast processing; Returns are put into blowing machine; Compressed air pressure is controlled to be 0.6MPa, and it is the silica sand of 5mm that blast adopts granularity, blast is carried out on the returns surface handle; Blow off the surperficial oxide debris of returns, formwork, sticking iron, be mingled with and burning into sand, make bright and clean, the no-sundries of material surface.
(2) K4169 alloy returns melting once
Adopt vacuum induction melting furnace to carry out the melting of alloy, the concrete operations step is: when vacuum tightness≤1.33Pa, begin to heat up, the control temperature rise rate is 15 ℃/min; When alloy surface presented garnet, the control temperature rise rate was 20 ℃/min, is warming up to 1590 ℃ of refining temperatures; Control refining time 20min has a power failure after the refining, stops heating; To alloy liquid level conjunctiva, controlling temperature rise rate then is 20 ℃/min, washes sull open; When temperature rises to 1450 ℃, pour into a mould teeming speed 4kg/s.For reducing the foreign matter content of alloy, the casting process of alloy is through two-stage filtration net filtration, one-level filtering net aperture 9mm; Be used to block bulk inclusion; Filtering net aperture, second stage 5mm is used for filtration and absorption to fine foreign matter, reaches the effect of purify hot metal.
(3) secondary smelting batching
Material ingot to after the returns melting once carries out chemical composition analysis, and by percentage to the quality, by the scheme batching of 50% returns+50% virgin material, virgin material promptly refers to new K4169 alloy material.Returns+virgin material meets following chemical constitution and requires (quality %):
C0.07, Cr20.0, Mo3.20, Al0.65, Ti0.85, Ni52.0, Nb+Ta4.80, all the other are Fe.
(4) secondary smelting prepares the revert alloy ingot
Adopt vacuum induction melting furnace to carry out the melting of alloy, the concrete operations step is: the element that melting once returns ingot, virgin material ingot and adjustment composition are added is together packed in the crucible, when vacuum tightness≤0.67Pa, begins to heat up; The control temperature rise rate is 15 ℃/min, and when alloy surface presented garnet, the control temperature rise rate was 20 ℃/min, is warming up to 1590 ℃ of refining temperatures; Control refining time 20min has a power failure after the refining, stops heating; To alloy liquid level conjunctiva, controlling temperature rise rate then is 20 ℃/min, washes sull open; When temperature rises to 1450 ℃, pour into a mould teeming speed 4kg/s.
(5) three meltings batching
Material ingot to behind the returns secondary smelting carries out chemical composition analysis, and by percentage to the quality, by the scheme batching of 50% secondary returns+50% virgin material, virgin material promptly refers to new K4169 alloy material.Secondary returns+virgin material meets following chemical constitution and requires (quality %):
C0.07, Cr20.0, Mo3.20, Al0.65, Ti0.85, Ni52.0, Nb+Ta4.80, all the other are Fe.
(6) three meltings prepare the revert alloy ingot
Adopt vacuum induction melting furnace to carry out the melting of alloy, the concrete operations step is: the element that secondary smelting returns ingot, virgin material ingot and adjustment composition are added is together packed in the crucible, when vacuum tightness≤0.67Pa, begins to heat up; The control temperature rise rate is 15 ℃/min, and when alloy surface presented garnet, the control temperature rise rate was 20 ℃/min, is warming up to 1590 ℃ of refining temperatures; Control refining time 20min has a power failure after the refining, stops heating; To alloy liquid level conjunctiva, controlling temperature rise rate then is 20 ℃/min, washes sull open; When temperature rises to 1450 ℃, pour into a mould teeming speed 4kg/s.
(7) homogenizing thermal treatment
Revert alloy ingot homogenizing process of thermal treatment condition to three meltings preparation is: 1095 ℃ ± 10 ℃, and time 2h ± 5min, after homogenizing thermal treatment, elements segregation situation such as Nb, Ti obviously improve.
Embodiment 3
It is following to utilize nickel-base cast superalloy K4169 returns to prepare the method process step of K4169 alloy.
(1) K4169 alloy returns pre-treatment
To the returns that produce in the K4169 alloy-steel casting production process is that rising head, running channel and waste casting carry out the blast processing; Returns are put into blowing machine; Compressed air pressure is controlled to be 0.3MPa, and it is the silica sand of 3mm that blast adopts granularity, blast is carried out on the returns surface handle; Blow off the surperficial oxide debris of returns, formwork, sticking iron, be mingled with and burning into sand, make bright and clean, the no-sundries of material surface.
(2) K4169 alloy returns melting once
Adopt vacuum induction melting furnace to carry out the melting of alloy, the concrete operations step is: when vacuum tightness≤1.33Pa, begin to heat up, the control temperature rise rate is 10 ℃/min; When alloy surface presented garnet, the control temperature rise rate was 10 ℃/min, is warming up to 1570 ℃ of refining temperatures; Control refining time 30min has a power failure after the refining, stops heating; To alloy liquid level conjunctiva, controlling temperature rise rate then is 15 ℃/min, washes sull open; When temperature rises to 1430 ℃, pour into a mould teeming speed 2kg/s.For reducing the foreign matter content of alloy, the casting process of alloy is through two-stage filtration net filtration, one-level filtering net aperture 6mm; Be used to block bulk inclusion; Filtering net aperture, second stage 3mm is used for filtration and absorption to fine foreign matter, reaches the effect of purify hot metal.
(3) secondary smelting batching
Material ingot to after the returns melting once carries out chemical composition analysis, and by percentage to the quality, by the scheme batching of 10% returns+90% virgin material, virgin material promptly refers to new K4169 alloy material.Returns+virgin material meets following chemical constitution and requires (quality %):
C0.03, Cr19.0, Mo2.95, Al0.50, Ti1.10, Ni54.0, Nb+Ta5.30, all the other are Fe.
(4) secondary smelting prepares the revert alloy ingot
Adopt vacuum induction melting furnace to carry out the melting of alloy, the concrete operations step is: the element that melting once returns ingot, virgin material ingot and adjustment composition are added is together packed in the crucible, when vacuum tightness≤0.67Pa, begins to heat up; The control temperature rise rate is 10 ℃/min, and when alloy surface presented garnet, the control temperature rise rate was 10 ℃/min, is warming up to 1570 ℃ of refining temperatures; Control refining time 30min has a power failure after the refining, stops heating; To alloy liquid level conjunctiva, controlling temperature rise rate then is 15 ℃/min, washes sull open; When temperature rises to 1430 ℃, pour into a mould teeming speed 2kg/s.
(5) three meltings batching
Material ingot to behind the returns secondary smelting carries out chemical composition analysis, and by percentage to the quality, by the scheme batching of 10% secondary returns+90% virgin material, virgin material promptly refers to new K4169 alloy material.Secondary returns+virgin material meets following chemical constitution and requires (quality %):
C0.03, Cr19.0, Mo2.95, Al0.50, Ti1.10, Ni54.0, Nb+Ta5.30, all the other are Fe.
(6) three meltings prepare the revert alloy ingot
Adopt vacuum induction melting furnace to carry out the melting of alloy, the concrete operations step is: the element that secondary smelting returns ingot, virgin material ingot and adjustment composition are added is together packed in the crucible, when vacuum tightness≤0.67Pa, begins to heat up; The control temperature rise rate is 10 ℃/min, and when alloy surface presented garnet, the control temperature rise rate was 10 ℃/min, is warming up to 1570 ℃ of refining temperatures; Control refining time 30min has a power failure after the refining, stops heating; To alloy liquid level conjunctiva, controlling temperature rise rate then is 15 ℃/min, washes sull open; When temperature rises to 1430 ℃, pour into a mould teeming speed 2kg/s.
(7) homogenizing thermal treatment
Revert alloy ingot homogenizing process of thermal treatment condition to three meltings preparation is: 1095 ℃ ± 10 ℃, and time 2h ± 5min, after homogenizing thermal treatment, elements segregation situation such as Nb, Ti obviously improve.
Embodiment 4
It is following to utilize nickel-base cast superalloy K4169 returns to prepare the method process step of K4169 alloy.
(1) K4169 alloy returns pre-treatment
To the returns that produce in the K4169 alloy-steel casting production process is that rising head, running channel and waste casting carry out the blast processing; Returns are put into blowing machine; Compressed air pressure is controlled to be 0.5MPa, and it is the silica sand of 3mm that blast adopts granularity, blast is carried out on the returns surface handle; Blow off the surperficial oxide debris of returns, formwork, sticking iron, be mingled with and burning into sand, make bright and clean, the no-sundries of material surface.
(2) K4169 alloy returns melting once
Adopt vacuum induction melting furnace to carry out the melting of alloy, the concrete operations step is: when vacuum tightness≤1.33Pa, begin to heat up, the control temperature rise rate is 12 ℃/min; When alloy surface presented garnet, the control temperature rise rate was 18 ℃/min, is warming up to 1580 ℃ of refining temperatures; Control refining time 20min has a power failure after the refining, stops heating; To alloy liquid level conjunctiva, controlling temperature rise rate then is 16 ℃/min, washes sull open; When temperature rises to 1450 ℃, pour into a mould teeming speed 3kg/s.For reducing the foreign matter content of alloy, the casting process of alloy is through two-stage filtration net filtration, one-level filtering net aperture 8mm; Be used to block bulk inclusion; Filtering net aperture, second stage 3mm is used for filtration and absorption to fine foreign matter, reaches the effect of purify hot metal.
(3) secondary smelting batching
Material ingot to after the returns melting once carries out chemical composition analysis, and by percentage to the quality, by the scheme batching of 50% returns+50% virgin material, virgin material promptly refers to new K4169 alloy material.
On returns+virgin material batching basis, add respective element again, with elementary composition being adjusted into (quality %) after the batching:
C0.065, Cr19.5, Mo3.15, Al0.60, Ti1.0, Ni52.5, Nb+Ta5.15, all the other are Fe.
(4) secondary smelting prepares the revert alloy ingot
Adopt vacuum induction melting furnace to carry out the melting of alloy, the concrete operations step is: the element that melting once returns ingot, virgin material ingot and adjustment composition are added is together packed in the crucible, when vacuum tightness≤0.67Pa, begins to heat up; The control temperature rise rate is 14 ℃/min, and when alloy surface presented garnet, the control temperature rise rate was 18 ℃/min, is warming up to 1585 ℃ of refining temperatures; Control refining time 20min has a power failure after the refining, stops heating; To alloy liquid level conjunctiva, controlling temperature rise rate then is 16 ℃/min, washes sull open; When temperature rises to 1450 ℃, pour into a mould teeming speed 4kg/s.
(5) three meltings batching
Material ingot to behind the returns secondary smelting carries out chemical composition analysis, and by percentage to the quality, by the scheme batching of 50% secondary returns+50% virgin material, virgin material promptly refers to new K4169 alloy material.
On secondary returns+virgin material batching basis, add respective element again, with elementary composition being adjusted into (quality %) after the batching:
C0.065, Cr19.5, Mo3.15, Al0.60, Ti1.0, Ni52.5, Nb+Ta5.15, all the other are Fe.
(6) three meltings prepare the revert alloy ingot
Adopt vacuum induction melting furnace to carry out the melting of alloy, the concrete operations step is: the element that secondary smelting returns ingot, virgin material ingot and adjustment composition are added is together packed in the crucible, when vacuum tightness≤0.67Pa, begins to heat up; The control temperature rise rate is 12 ℃/min, and when alloy surface presented garnet, the control temperature rise rate was 18 ℃/min, is warming up to 1575 ℃ of refining temperatures; Control refining time 20min has a power failure after the refining, stops heating; To alloy liquid level conjunctiva, controlling temperature rise rate then is 18 ℃/min, washes sull open; When temperature rises to 1438 ℃, pour into a mould teeming speed 2.5kg/s.
(7) homogenizing thermal treatment
Revert alloy ingot homogenizing process of thermal treatment condition to three meltings preparation is: 1095 ℃ ± 10 ℃, and time 2h ± 5min, after homogenizing thermal treatment, elements segregation situation such as Nb, Ti obviously improve.
Claims (5)
1. method of utilizing nickel-base cast superalloy K4169 returns to prepare the K4169 alloy is characterized in that process step is following:
(1) K4169 alloy returns pre-treatment
To the returns that produce in the K4169 alloy-steel casting production process is that rising head, running channel and waste casting carry out the blast processing;
(2) K4169 alloy returns melting once
Adopt vacuum induction melting furnace to carry out the melting of alloy, when vacuum tightness≤1.33Pa, begin to heat up, the control temperature rise rate is 10～15 ℃/min; When alloy surface presented garnet, the control temperature rise rate was 10～20 ℃/min, is warming up to 1570～1590 ℃ of refining temperatures, control refining time 20～30min; Have a power failure after the refining, stop heating, to alloy liquid level conjunctiva, controlling temperature rise rate then is 15～20 ℃/min; Wash sull open, when temperature rises to 1430～1450 ℃, pour into a mould, teeming speed 2～4kg/s; Casting process is through two-stage filtration net filtration, one-level filtering net aperture 6～9mm, filtering net aperture, the second stage 3～5mm;
(3) secondary smelting batching
Material ingot to after the returns melting once carries out chemical composition analysis, and by percentage to the quality, by the scheme batching of 10～50% returns+50～90% virgin materials, by mass percentage, a returns+virgin material should meet following chemical constitution and require:
C0.03～0.07, Cr19.0～20.0, Mo2.95～3.20, Al0.50～0.65, Ti0.85～1.10, Ni52.0～54.0, Nb+Ta4.80～5.30, all the other are Fe;
(4) secondary smelting prepares the revert alloy ingot
Adopt vacuum induction melting furnace to carry out the melting of alloy, the element that melting once returns ingot, virgin material ingot and adjustment composition are added is together packed in the crucible, when vacuum tightness≤0.67Pa, begins to heat up; The control temperature rise rate is 10～15 ℃/min, and when alloy surface presented garnet, the control temperature rise rate was 10～20 ℃/min; Be warming up to 1570～1590 ℃ of refining temperatures, control refining time 20～30min has a power failure after the refining; Stop heating, to alloy liquid level conjunctiva, controlling temperature rise rate then is 15～20 ℃/min; Wash sull open, when temperature rises to 1430～1450 ℃, pour into a mould;
(5) three meltings batching
Material ingot to behind the returns secondary smelting carries out chemical composition analysis, and by percentage to the quality, by the scheme batching of 10～50% secondary returns+50～90% virgin materials, by mass percentage, secondary returns+virgin material should meet following chemical constitution and require:
C0.03～0.07, Cr19.0～20.0, Mo2.95～3.20, Al0.50～0.65, Ti0.85～1.10, Ni52.0～54.0, Nb+Ta4.80～5.30, all the other are Fe;
(6) three meltings prepare the revert alloy ingot
Adopt vacuum induction melting furnace to carry out the melting of alloy, the element that secondary smelting returns ingot, virgin material ingot and adjustment composition are added is together packed in the crucible, when vacuum tightness≤0.67Pa, begins to heat up; The control temperature rise rate is 10～15 ℃/min, and when alloy surface presented garnet, the control temperature rise rate was 10～20 ℃/min; Be warming up to 1570～1590 ℃ of refining temperatures, control refining time 20～30min has a power failure after the refining; Stop heating, to alloy liquid level conjunctiva, controlling temperature rise rate then is 15～20 ℃/min; Wash sull open, when temperature rises to 1430～1450 ℃, pour into a mould;
(7) homogenizing thermal treatment
Revert alloy ingot homogenizing process of thermal treatment condition to three meltings preparation is: 1095 ℃ ± 10 ℃, and time 2h ± 5min.
2. according to the described method of utilizing nickel-base cast superalloy K4169 returns to prepare the K4169 alloy of claim 1; It is characterized in that the blast processing in the step (1); Be that returns are put into blowing machine, compressed air pressure is controlled to be 0.3～0.6MPa, and it is the silica sand of 3～5mm that blast adopts granularity; Blast is carried out on the returns surface handle, blow off the surperficial oxide debris of returns, formwork, sticking iron, be mingled with.
3. according to the described method of utilizing nickel-base cast superalloy K4169 returns to prepare the K4169 alloy of claim 1, it is characterized in that in the step (4) teeming speed 2～4kg/s.
4. according to the described method of utilizing nickel-base cast superalloy K4169 returns to prepare the K4169 alloy of claim 1, it is characterized in that in the step (6) teeming speed 2～4kg/s.
5. according to the described method of utilizing nickel-base cast superalloy K4169 returns to prepare the K4169 alloy of claim 1, it is characterized in that described virgin material is new K4169 alloy material.
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| CN103667586B (en) * | 2012-09-12 | 2015-07-15 | 上海丰渠特种合金有限公司 | Preparation method of UNS N07718 high-temperature alloy |
| CN102965535B (en) * | 2012-11-15 | 2014-12-10 | 沈阳黎明航空发动机(集团)有限责任公司 | Method for preparing alloy K414 from return scraps of cast high-temperature alloy K414 |
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| CN111910095B (en) * | 2020-08-05 | 2021-06-01 | 浙江省科创新材料研究院 | Smelting preparation method of nickel-based single crystal superalloy master alloy |
| CN113020552B (en) * | 2021-05-28 | 2021-09-17 | 北京科技大学 | Launder for metal casting and method for smelting GH4169 alloy by using return materials |
| CN113458402A (en) * | 2021-07-07 | 2021-10-01 | 中国航发北京航空材料研究院 | Method for preparing high-temperature alloy powder by using nickel-based high-temperature alloy powder return material |
| CN113652564B (en) * | 2021-10-19 | 2021-12-14 | 北京科技大学 | Method for smelting high-temperature alloy by using return material |
| CN114318194B (en) * | 2022-03-16 | 2022-06-07 | 河北钢研德凯科技有限公司北京分公司 | Nickel-based casting high-temperature alloy, heat treatment method thereof and alloy casting |
| CN114892012A (en) * | 2022-04-25 | 2022-08-12 | 中国航发成都发动机有限公司 | Remelting purification method of nickel-based superalloy return material |
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